The Collaborative International Dictionary of English v.0.48:

Shrug \Shrug\ (shr[u^]g), v. t. [imp. & p. p. Shrugged
   (shr[u^]gd); p. pr. & vb. n. Shrugging (shr[u^]g"g[i^]ng).]
   [Probably akin to shrink, p. p. shrunk; cf. Dan. skrugge,
   skrukke, to stoop, dial. Sw. skrukka, skruga, to crouch.]
   To draw up or contract (the shoulders), especially by way of
   expressing doubt, indifference, dislike, dread, or the like.
   [1913 Webster]

         He shrugs his shoulders when you talk of securities.
                                                  --Addison.
   [1913 Webster]